public class FloatDragView { private Activity context; // 上下文 private ImageView mImageView; // 可拖動按鈕 private static int mScreenWidth = -1; //屏幕的寬度 private static int mScreenHeight = -1; //屏幕的高度 private int relativeMoveX; // 控件相對屏幕左上角移動的位置X private int relativeMoveY; // 控件相對屏幕左上角移動的位置Y private boolean isIntercept = false; // 是否截斷touch事件 private int startDownX; // 按下時的位置控件相對屏幕左上角的位置X private int startDownY; // 按下時的位置控件距離屏幕左上角的位置Y private static int[] lastPosition; // 用於記錄上一次的位置(座標0對應x,座標1對應y) /** * @param context 上下文 * @param mViewContainer 可拖動按鈕要存放的對應的Layout * @param clickListener 可拖動按鈕的點擊事件 */ public static ImageView addFloatDragView(Activity context , RelativeLayout mViewContainer, View.OnClickListener clickListener) { FloatDragView floatDragView = new FloatDragView(context); ImageView imageView = floatDragView.getFloatDragView(clickListener); mViewContainer.addView(imageView); return imageView; } // 初始化實例 private FloatDragView(Activity context) { setScreenHW(context); this.context = context; lastPosition = new int[]{0,0}; } // 獲取可拖動按鈕的實例 private ImageView getFloatDragView(View.OnClickListener clickListener) { if (mImageView != null) { return mImageView; } else { mImageView = new ImageView(context); mImageView.setClickable(true); mImageView.setFocusable(true); mImageView.setImageResource(R.mipmap.ic_launcher); setFloatDragViewParams(mImageView); mImageView.setOnClickListener(clickListener); setFloatDragViewTouch(mImageView); return mImageView; } } // 設置可拖動按鈕的位置參數 private void setFloatDragViewParams(View floatDragView) { // 記錄最後圖片在窗體的位置 int moveX = lastPosition[0]; int moveY = lastPosition[1]; if (0 != moveX || 0 != moveY) {// 移動後的位置 // 每次移動都要設置其layout，不然由於父佈局可能嵌套listView，當父佈局發生改變沖毀（如下拉刷新時）則移動的view會回到原來的位置 RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); lpFeedback.setMargins(moveX, moveY, 0, 0); floatDragView.setLayoutParams(lpFeedback); } else {// 初始位置 RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); lpFeedback.setMargins(0, 0, 20, 218); lpFeedback.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); lpFeedback.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); floatDragView.setLayoutParams(lpFeedback); } } // 可拖動按鈕的touch事件 private void setFloatDragViewTouch(final ImageView floatDragView) { floatDragView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(final View v, MotionEvent event) { int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: isIntercept = false; startDownX = relativeMoveX = (int) event.getRawX(); startDownY = relativeMoveY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - relativeMoveX; int dy = (int) event.getRawY() - relativeMoveY; int left = v.getLeft() + dx; int top = v.getTop() + dy; int right = v.getRight() + dx; int bottom = v.getBottom() + dy; if (left < 0) { left = 0; right = left + v.getWidth(); } if (right > mScreenWidth) { right = mScreenWidth; left = right - v.getWidth(); } if (top < 0) { top = 0; bottom = top + v.getHeight(); } if (bottom > mScreenHeight) { bottom = mScreenHeight; top = bottom - v.getHeight(); } v.layout(left, top, right, bottom); relativeMoveX = (int) event.getRawX(); relativeMoveY = (int) event.getRawY(); break; case MotionEvent.ACTION_UP: int lastMoveDx = Math.abs((int) event.getRawX() - startDownX); int lastMoveDy = Math.abs((int) event.getRawY() - startDownY); if (5 < lastMoveDx || 5 < lastMoveDy) {// 防止點擊的時候稍微有點移動點擊事件被攔截了 isIntercept = true; } else { isIntercept = false; } // 每次移動都要設置其layout，不然由於父佈局可能嵌套listview， // 當父佈局發生改變沖毀（如下拉刷新時）則移動的view會回到原來的位置 RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); lpFeedback.setMargins(v.getLeft(), v.getTop(), 0, 0); v.setLayoutParams(lpFeedback); // preferenceUtil.saveInt("moveX", v.getLeft()); // preferenceUtil.saveInt("moveY", v.getTop()); // 設置靠近邊沿的 setImageViewNearEdge(v); break; } return isIntercept; } }); } // 將拖動按鈕移動到邊沿 private void setImageViewNearEdge(final View v) { if (v.getLeft() < ((Utils.getScreenSize(context).x) / 2)) { // 設置位移動畫 向左移動控件位置 final TranslateAnimation animation = new TranslateAnimation(0, -v.getLeft(), 0, 0); animation.setDuration(300);// 設置動畫持續時間 animation.setRepeatCount(0);// 設置重複次數 animation.setFillAfter(true); animation.setRepeatMode(Animation.ABSOLUTE); animation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation arg0) { // TODO: 2017/3/1 } @Override public void onAnimationRepeat(Animation arg0) { // TODO: 2017/3/1 } @Override public void onAnimationEnd(Animation arg0) { v.clearAnimation(); RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); lpFeedback.setMargins(0, v.getTop(), 0, 0); v.setLayoutParams(lpFeedback); v.postInvalidateOnAnimation(); lastPosition[0] = 0; lastPosition[1] = v.getTop(); } }); v.startAnimation(animation); } else { final TranslateAnimation animation = new TranslateAnimation(0, (Utils.getScreenSize(context).x - v.getLeft() - v.getWidth()), 0, 0); animation.setDuration(300);// 設置動畫持續時間 animation.setRepeatCount(0);// 設置重複次數 animation.setRepeatMode(Animation.ABSOLUTE); animation.setFillAfter(true); animation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation arg0) { // TODO: 2017/3/1 } @Override public void onAnimationRepeat(Animation arg0) { // TODO Auto-generated method stub } @Override public void onAnimationEnd(Animation arg0) { v.clearAnimation(); RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); lpFeedback.setMargins(Utils.getScreenSize(context).x - v.getWidth(), v.getTop(), 0, 0); v.setLayoutParams(lpFeedback); v.postInvalidateOnAnimation(); lastPosition[0] =Utils.getScreenSize(context).x - v.getWidth(); lastPosition[1] = v.getTop(); } }); v.startAnimation(animation); } } // 計算屏幕的實際高寬 private void setScreenHW(Activity context) { if (mScreenHeight < 0) { // 減去狀態欄高度，否則挨着底部移動，導致圖標變小 Point screen = Utils.getScreenSize(context); mScreenWidth = screen.x; mScreenHeight = screen.y - Utils.getStatusBarHeight(context); } } }
public class Utils { // 狀態欄高度 private static int statusBarHeight = 0; // 屏幕像素點 private static final Point screenSize = new Point(); // 獲取屏幕像素點 public static Point getScreenSize(Activity context) { if (context == null) { return screenSize; } WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); if (wm != null) { DisplayMetrics mDisplayMetrics = new DisplayMetrics(); Display diplay = wm.getDefaultDisplay(); if (diplay != null) { diplay.getMetrics(mDisplayMetrics); int W = mDisplayMetrics.widthPixels; int H = mDisplayMetrics.heightPixels; if (W * H > 0 && (W > screenSize.x || H > screenSize.y)) { screenSize.set(W, H); } } } return screenSize; } // 獲取狀態欄高度 public static int getStatusBarHeight(Context context) { if (statusBarHeight <= 0) { Rect frame = new Rect(); ((Activity) context).getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); statusBarHeight = frame.top; } if (statusBarHeight <= 0) { try { Class<?> c = Class.forName("com.android.internal.R$dimen"); Object obj = c.newInstance(); Field field = c.getField("status_bar_height"); int x = Integer.parseInt(field.get(obj).toString()); statusBarHeight = context.getResources().getDimensionPixelSize(x); } catch (Exception e1) { e1.printStackTrace(); } } return statusBarHeight; } }
使用方法：
relativeLayout就是要出現懸浮按鈕的界面的根view。
FloatDragView.addFloatDragView(this, relativeLayout, new View.OnClickListener() { @Override public void onClick(View view) { // 點擊事件 } });
